1 Scope
This standard specifies the terms and definitions, symbols and interpretations, components and materials, technical requirements, inspection rules, marking, packaging, transport and storage, inspection and monitoring of external prestressing tendons (hereinafter referred to as external tendon).
This standard is applicable to newly-built prestressed concrete girder bridge structures. Reference may be made to this standard for the external tendons used for maintenance and reinforcement of existing bridge structures and for other structures.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 175 Common portland cement
GB/T 230.1 Metallic materials - Rockwell hardness test - Part 1: Test method (Scales A, B, C, D, E, F, G, H, K, N, T)
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1: Test method
GB/T 254 Semi-refined paraffin wax
GB/T 700 Carbon structural steels
GB/T 1591 High strength low alloy structural steels
GB/T 5224 Steel strand for prestressed concrete
GB/T 5796.1 Trapezoidal screw threads - Part 1: Profiles
GB/T 5796.2 Trapezoidal screw threads - Part 2: System of diameter and pitch
GB/T 5796.3 Trapezoidal screw threads - Part 3: Basic dimensions
GB/T 5796.4 Trapezoidal screw threads - Part 4: Tolerances
GB/T 6402-2008 Steel forgings - Method for ultrasonic testing
GB/T 8162 Seamless steel tubes for structural purposes
GB/T 11352 Carbon steel castings for general engineering purpose
GB/T 14370 Anchorage, grip and coupler for prestressing tendons
GB/T 18365 Technical conditions for hot-extruding PE protection high strength wire cable of cable-stayed bridge
GB/T 21073 Epoxy-coated seven-wire prestressing steel strand
GB/T 21839-2008 Steel for prestressed concrete - Test methods
GB/T 25823-2010 Individual epoxy-coated wire prestressing steel strand
GB 50204 Code for acceptance of constructional quality of concrete structures
GBJ 132 Basic terms and general symbols of structure deign
CJ/T 297 High density polyethylene sheathing compounds for bridge cable
JB/T 4730.4 Nondestructive testing of pressure equipments - Part 4: Magnetic particle testing
JB/T 5000.13 Heavy mechanical general techniques and standards - Part 13: Packing
JG 161 Unbonded prestressing steel strand
JG/T 3007 Corrosion-resistant and lubricating grease specialized for unbonded tendons
JG/T 5028 Hydraulic jack for prestressing
JG/T 5029 Electric oil pump for pretressing
JGJ 63 Standard of water for concrete
YB/T 152 High strength low relaxation hot-dip galvanized Steel strand for prestress
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GBJ 132 and the following apply.
3.1
external prestressing tendon components
assembly of external prestressing tendon, anchorage device, deviator, damper, etc.
3.2
external prestressing tendon
combination of external tensile elements of tendon and its corrosion prevention and protection
3.3
external tensile elements of tendon
steel strand outside the section of a member that is prestressed
3.4
deviator
device that changes the direction of transmission of force in a prestressing tendon so as to let the external tensile elements of tendon deviate in a centralized way
3.5
damper
device for reducing vibration amplitude of external prestressing tendon and changing natural vibration frequency of external prestressing tendon to avoid resonance with structure
3.6
duct
protective sleeve that is externally wrapped or sleeved on external tensile elements of tendon to prevent corrosion and mechanical damage of the external tensile elements of tendon
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and interpretations
5 Components and materials
5.1 General requirements
5.2 External prestressing tendon
5.3 Deviator
5.4 Anchorage devices
5.5 Damper
5.6 Accessories
6 Technical requirements
6.1 General requirements
6.2 Corrosion protection performance
6.3 Anchoring performance of anchorage device
6.4 Under-anchor load transfer performancecc
6.5 Fatigue performance of external prestressing tendon components
6.6 Static load strength of the deviator
6.7 Wear resistance of the external protective layer for the deviator zone of the external prestressing tendon
6.8 Filling performance of the duct
6.9 Replaceability of external tendon
6.10 Restressability of external tensile elements of tendon
6.11 Tightness of anchorage zone
7 Inspection rules
7.1 Inspection classification
7.2 Type inspection
7.3 End-of-manufacturing inspection
7.4 Receiving inspection
8 Marking, packaging, transport and storage
8.1 Marking
8.2 Packaging
8.3 Transport and storage
9 Construction
9.1 Blanking and fabrication
9.2 Installation and tensioning
9.3 Grouting with cement slurry for filling
9.4 Construction acceptance
10 Inspection and monitoring
10.1 General requirements
10.2 Inspection and monitoring items
10.3 Inspection information feedback and processing
Annex A (Normative) Cement slurry materials used for filling
Annex B (Informative) Selection and configuration of external prestressing tendon components
Annex C (Normative) Anchorage performance test of anchorage device under static load
Annex D (Normative) Under-anchor load transfer test
Annex E (Normative) Fatigue test of components of anchorage device
Annex F (Normative) Static load test of deviators
Annex G (Normative) Fatigue test of deviator zone of external prestressing tendon
Annex H (Normative) Test on outer protective layer of deviator zone of external prestressing tendon
Annex I (Normative) Duct filling test
Annex J (Normative) External tendon replaceable test
Annex K (Normative) Test for restressable tensioning of external tensile elements of tendon
Annex L (Normative) Tightness test of anchorage zone
